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Proceedings Paper

Relationship between conjugation length and third-order nonlinearity in bis-donor substituted diphenyl polyenes
Author(s): Charles W. Spangler; Kathleen O. Havelka; Mark W. Becker; Tracy Ann Kelleher; Lap-Tak A. Cheng
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Paper Abstract

In the design of new organic materials with enhanced nonlinear optical activity, it has been predicted that (gamma) , the third order hyperpolarizability (second hyperpolarizability) will not increase indefinitely in a regular fashion as the conjugation length increases. In regular polyenes, for example, (gamma) has been predicted to level off after circa 10 - 15 repeat units. However, very few experimental systems have been investigated in which the number of repeat units approach these limits. Synthetic difficulties and the lack of solubility of longer oligomers has precluded accurate measures of (gamma) in polyenylic series of well- characterized compounds. In the present study, we discuss how long, and branched-chain alkyl groups attached via alkoxy-substituted phenyl rings can greatly increase the solubility of long polyene oligomers for D,D- and D,A- substituent patterns. This allows, for the first time, a comprehensive study of how (gamma) varies with conjugation length and symmetrical versus asymmetrical substitution.

Paper Details

Date Published: 1 December 1991
PDF: 9 pages
Proc. SPIE 1560, Nonlinear Optical Properties of Organic Materials IV, (1 December 1991);
Show Author Affiliations
Charles W. Spangler, Northern Illinois Univ. (United States)
Kathleen O. Havelka, Northern Illinois Univ. (United States)
Mark W. Becker, Northern Illinois Univ. (United States)
Tracy Ann Kelleher, Northern Illinois Univ. (United States)
Lap-Tak A. Cheng, E.I. du Pont de Nemours & Co., Inc. (United States)

Published in SPIE Proceedings Vol. 1560:
Nonlinear Optical Properties of Organic Materials IV
Kenneth D. Singer, Editor(s)

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